Pumping-jack.



C. A. GASS.

PUMPING JACK.

APPLICATION man AUG.4, I915.

1 1 9 1 ,780. V Patented July 18, 1916.

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UNITED STATES PATENT onnron cHAnLEs'A; GASS, or RED noon, ARIZONA.

PUMPING-JACK.

Specification of Letters Patent.

Patented July 18, 1916.

Application fi1ed August 4, 1915.", Serial No. 43,549.

To all whom it may concern Be it known that I, CHARLES A.'GASS,'8. citizen of the United States, and a resident 7 of Red Rock, county of Pinal, State of Arito accomplish this purpose, but these mecha-' nisms usually embody cams and gears of more or less complex nature.

The object of my device is to accomplish these results with 'a very few, simple and direct linkage connections between. the cranks and the pump rods. 1

A further objectof my invention is to so arrange said linkage connections that the proportion of each revolution ofthe crank during which the corresponding pump rod is lifting shall be substantially greater than the proportion during which the pump rod is being depressed.

A still further object of my inventionis to so proportion. the several linkage connections that the .rate at which the individual pump rods are lifted shall be substantially uniform from the beginning to the end of every stroke instead of continuously increasing from the beginningof the stroke to its middle point and then continuously decreasing for the remainder of the stroke as is common in most arrangements.

In the arrangement herein disclosed, the

parts are so proportioned that one pump begins to pick up its load on the upper stroke about 20 earlier in the revolution of its crank than does the other pump. To

off-set this difference'and to cause the overlap of the lifting strokes to be the same at both ends, I preferably off-set the crank belonging to the pump which picks up latest,

'170" later while the crank of the 1 731 pump follows the crank of the second pump 190 later.

One form of my mechanism is illustrated in the accompanying drawings in which- Figure 1 represents a vertical sectional elevation, the section being taken on the line 11 of Fig. 2; Fig. 2 is a rear elevation of the pumping jack; Fig. Slis, a vertical section through the middle of the machine representing the cranks" and associated parts in the opposite position from that shown in Fig. 1 and Fig. 4 is a diagrammatic view of the mechanism.

Referring to the drawings 1 represents the frame of the machine which may consist of two upright brackets spaced apart and adapted to support the mechanism including slidewa'ys 2 which are'secured to each side of the frame '1 and upon which crossheads 3 and 4 are adapted to reciprocate up and down during the pumping operation. The upper crosshead 3 is preferably connected with the pump rod 5which latter is adapted to slide'in the concentrically arranged pipe or tubular pump rod 6 which is secured't'o the lower crosshead 4 substantially as indicated in, the drawings. This'form of pump, having concentrically arranged pump rods is well known in the art and therefore it is not necessary to further describe it and it is not here completely shown.

For operating the two pump rods I mount in the frame a crank shaft 7 provided with the usual fly wheel 8, said crank shaft, in the present instance, being provided with two sub stantially oppositely disposed sets of cranks, one crank 7 b at the center and the other crank 7 being divided or in duplicate having a half on each side of the center, the oppositely disposed cranks being as. previously indicated relatively displaced circumferentially so thatone is in advance of the other about 190. 7 To each crankl connect, directly by means of a boxing" 9, a walking beam 10 whichis fulcrumed at 11 to the upper end of a link 12 pivoted to a rod 18 supported in the frame 1 of the machine the links- 12 thereby acting as floating fulcrum supports for the walking beams. The outer ends of the walking beams 10 are pivotally connected at 10 with links 14: and 15, the latter (15) being connected to the crosshead 3 of the upper pump rod v 5, while the former (14) is connected to the lower cross head 4 011 the pipe or tubular pump rod 6. The walking beams may be constructed in any suitable manner either of a single piece or two pieces as illustrated in the drawings and may be connected to the, cranks in any suitable manner. The cranks 7 are oppositely disposed from the cranks 7 and the walking beams connected therewith are adapted to operate the lower crosshead 4: by means of the links 14 while the crank 7 by means of its walking beam and the links 15, is adapted to operate the upper cross head 3. It will be seen from this arrangement that when the crank shaft 7 is rotated the walking beams are not only rocked about the fulcrum 11 but are bodily reciprocated so that the free ends of the walking beams are constrained to pass through a compound curved path substantially as indicated at B in Fig. 4 of the drawings.

Referring more. particularly to Flg. 4 it will be seen that as the cranks rotatecounter-clockwise, as indicated by the arrows, the outer or free end A of the walking beam A will be moving clockwise upwardly along the curve B while at the same time the outer end C of the walking beam C will be moving clockwise downwardly. It will thus be seen that the point D, which represents the connection of the link 15 with the upper crosshead 3, will be moving upward to lift the pump rod 5 while the point E, representing the connection between the link 14 and the lower crosshead 4, will be moving downward and thereby carrying the piston con nected with the pipe rod 6 downward to get a fresh hold on the stream of Water. It will be observed by tracing the movements of the parts in Fig. 4, that the overlapping of the strokes, will give substantially a continuous flow. The dotted lines F in Fig. 4 indicate the extremes of the movement of the floating fulcrum links 12 of the walking beams during a complete rotation of the cranks. As previously pointed out the crank 7 is preferably approximately 190 in advance of the crank 7 b while durin the rotation of the crank shaft the crank is lifting during about 200 of circumferential movement while the crank 7 utilizes about 180 for the lifting movement. This overlap of 20 is adapted to provide a substan tially continuous flow of the stream being lifted by the pump. This linkage arrangement is adapted to carry the pump rods up and down in a more nearly uniform manner so that, at the extremes of movement, the pump. rods are gradually stopped and started in the opposite direction, thereby relieving the mechanism of any undue jars or strains.

While I have shown a preferable construction and arrangement of the parts it Will be understood that the connecting links from the walking beams may extend in the same direction either up or down if desired, or to meet any special construction or adaptation of my device. Obviously, also, the relative positions of the oppositely disposed cranks be 180 or other suitable angle to give any modification or variation of the lap of the plungers.

It will be understood that suitable counterbalancing devices may be employed to counterbalance the pump rods and other moving parts of the mechanism and various modifications of the specific details of the mechanism may be madewithout departing from the spirit and scope of my invention.

I claim:

1. In a pumping jack the combination with pump rods of a crank shaft having op positely disposed cranks, a walking beam having one end directly pivoted to each of said cranks, a floating fulcrum for each walking beam, and links connecting the outer ends of the respective walking beams to the pump rods.

2. In a pumping jack the combination of a frame, a crank shaft having oppositely disposed cranks revolubly mounted therein, a walking beam having one end directly pivoted to each of said cranks, links pivotally supported by said frame and pivotally connected to the respective Walking beams to form floating fulcrums therefor, a pair of pump rods, concentrically arranged, and links connecting the outer ends of said walking beams to the respective pump rods whereby the latter are adapted to be reciprocated simultaneously in opposite directions.

3. In a pumping jack the combination of a frame, a crank shaft having oppositely disposed cranks revolubly mounted therein, a walking beam connected directly at one end to each of said cranks, a rocking link for each walking beam adapted to form a floating fulcrum therefor, said links being supported by the frame, vertically disposed slideways on said frame, crossheads slidably mounted thereon, one at each end, a pump rod connected to each crosshead, said pump rods being concentrically arranged,

and connecting links between the outer ends of said walking beams and the respective crossheads whereby said pump rods are adapted to be reciprocated simultaneously in opposite directions.

4. In a pumping jack the combination 3.2

with pump rods of a frame, a crank shaft having oppositely disposed cranks mounted 1n said frame, a walking beam having one end directly pivoted to each of said cranks,

ing beams to the respective pump rods, and links pivotally supported by the frame and pivotally connected to the respective walking beams at points between the crank and pump rod link connections, the parts being links connecting the outer ends of said walkso proportioned and dimensioned that the connection between the Walking beam and the link going to the pump rod Will trace a compound curved path substantially as described.

5. In a pumping jack the combination with pump rods of a crank shaft having oppositely disposed cranks, a Walking beam having one end directly pivoted to each of said cranks, links connectlng the outer ends of the respective Walking beams to the pump rods and a floating fulcrum for each walking beam located at a point between its ends, the parts being so proportioned and dimensioned that the rate of stroke of each pump is substantially proportional to the rotation of the crank and the time during whichvthe individual pumps lift is substantially in excess of the time during Which they are de-. pressed.

In testimony whereof I have hereunto set my hand.

CHARLES A. GASS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

